大跨隧道下穿建筑物施工方案对比分析及施工技术

以洛阳周山隧道下穿村庄民房为工程背景，采用FLAC3D建立三维数值模型对比分析了三台阶法和CD法下穿施工引起建筑物变位、隧道支护受力及隧道周边地层塑性区分布规律等，确定采用CD法施工。在施工过程中对建筑物沉降进行监测，结果表明，建筑物沉降规律与数值模型计算结果吻合较好，保证了建筑物的安全。

Comparison Analysis of Tunnel Construction Schemes Under crosssing Buildings and its Construction Technique

Taken Zhoushan tunnel undercrosssing building as background, by use of three dimensional numerical models, comparisons between the simulated results of three benched and CD methods, such as building settlements caused by tunneling, stress of primary support and plastic zone distribution, are analyzed. On the basis of the comparison results, the CD method is determined to excavate tunnel undercrosssing the building. The monitoring results of building settlement during tunneling have shown that simulated results have good agreement with those of monitoring ones, and the adopted construction method has guaranteed the safety of the building.